package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    
    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    
    /**
     * 微信登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        
        String openId = getOpenId(userLoginDTO.getCode());
        //判断是否获取到
        if (openId == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        
        //判断用户表中是否存在当前用户
        User user = userMapper.getByOpenid(openId);
        if (user == null) {
            //新建用户
            user = User.builder()
                .openid(openId)
                .createTime(LocalDateTime.now())
                .build();
            userMapper.insertUser(user);
        }
        return user;
    }
    
    
    /**
     * 获取openid
     *
     * @param code
     * @return
     */
    public String getOpenId(String code) {
        //向微信接口服务发送请求
        //appid=<AppId>&secret=<AppSecret>&js_code=<code>&grant_type=authorization_code
        Map<String, String> param = new HashMap<>();
        param.put("appid", weChatProperties.getAppid());
        param.put("secret", weChatProperties.getSecret());
        param.put("js_code", code);
        param.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, param);
        
        JSONObject jsonObject = JSON.parseObject(json);
        String openId = jsonObject.getString("openid");
        return openId;
    }
}
